Heel nailing machine



Dec. 29, 1942. I c. M. DE WOLF-E 2,306,530

HEEL NAILING MAQHINE Filed July 23, 1941 175551705 .ZZJEZL/b/Z E Patented Dec. 29, 1942 HEEL NAILING MACHINE Clarence M. De Wolfe; Somerville, Mass., assignor to The B. F. Goodrich Company, New York,

N.Y., a corporation of New York Application July 23, 1941, Serial'No. 403, 24

' 8 Claims. --'(ol. 1-32) This invention relates to heel-nailing machines such as are utilized for attaching wooden heels to shoes.

Heretofore in the use of nailing machines for 2 securing wooden heels to shoes many or the heels have been Split during the nailing operation, requiring the removal and replacement of the darnaged heels with considerable labor.

."Th principal objects of the present invention .1

are to reduce the number of heels split during application, to provide uniform support to the heel during the nailing operation, to provide cushioning of the anvil, and to provide for quick replacement of the anvil face.

These and other objects will appear from the 7 following description and the accompanying drawing.

Of the drawing:

Fig. 1 is a sectional elevation of a nailing machine embodying the invention.

Fig. 2 is a sectional detail view of theanvil and a heel supported thereby.

Fig. 3 is a perspective view of a removable anvil face, partly broken away and partly in section.

In accordance with the invention the anvil of the nailing machine is provided with a concave Referring to the drawing, and first to a type of machine'with which my invention may be advantageously used, the numeral l0 designates the frame of a nailing machine in which a horizontally disposed shaft l l is journaled, as at l2, I3. The shaft has a hammer cam 14 fixed to one end thereof, and a one-revolution clutch member 15 fixed to its other end on which a fiy-wheel I6 is journaled. A motor I1 drives the fly-wheel continuously through a pinion l8 fixed to the motor shaft and engaging gear teeth I9 on the fiy-wheel. A shoe is supported from the frame 10 by a hammer guide 2| the upper end of which supports a nail guide plate 22 which guides the nails 23 supported on a hammer 24 slidable, vertically through the hammer guide. The nails may be fed to the nail-guide plate 22 from a hopper 56 by means of a transport plate 51.

To hold the heel 25 in place against the driving face, an anvil 26 is slidably mounted on the frame ID for vertical movement. A treadle 21 is pivoted at 28 to the frame, and a link 29 connects 55 the treadle and the anvil. The treadle is supported by an extension coil spring 30 but may be depressedto force the anvil against the heel.

The clutch member I5 is slotted to receiv a dog 31 slidably fitted therein. The dog is forced toward the fly-wheel by a spring 32 but is restrained by a latch 33 fixed to a rock shaft34. An arm 35 is fixed to shaft 34 and a torsion coil spring 36 having its ends fixed to the arm 35 and the frame II) respectively holds the latch in latching position where it is in the path of rotation of the dog 3| and acts to hold it out of ngagementwith notches 31 in the fly-wheel. A stop 38 is adjustably mounted on rod 29 where it is held by a set-screw 39. 1 A-pawl 40 is pivoted at 4| on the stop 38, and extends in the path of the arm 35. A shoulder 42 on the pawl normally engages a shoulder 43 on the stop 38 which prevents its rotation in a counterclockwise direction. A coil spring 44 extendingbetween stop 38 and arm 40 holds the pawl in the position shown but permits rotation thereof in a clockwise direction. The arrangement is such that when rod 29 is lowered by pedal 21, pawl 40 rocks arm 35 about shaft 34 engaging the clutch, and when pedal 21' isreleaSed spring 44 permits the pawl to pass arm 35 and resets the clutch engaging mechanism. As a result, when the anvil 26 is lowered to a position to clamp the heel against the shoe, the clutch is automatically engaged and hammer 24 drives the nails by consecutive blows until the foot pedal is released.

In accordance with my invention, to prevent slipping of the heel during the nail-driving operation, the anvil 26 is formed with a concave face of greater spread than the tread face of the heel, as shown, adapted to contact the outer periphery of the tread face of th heel, and this face may be roughened as at 5|, by knurling or the like, to prevent slippage. Where the anvil 26 has a flat face such as is ordinarily provided on such machines, a removable anvil face 52 may be provided. Such a removable face may be formed of sheet metal to provide the concave roughened face 50 and, has integral retaining tabs 53 at its outer periphery. It is desirable to cushion the removable face somewhat from the anvil to equalize pressure against the heel and for this purpose a'washer 54 of vulcanized fiber or other tough hard cushioning material having the form of the heel face and centrally apertured, as at 55, may be placed between th anvil and its, removable face.

The operation of the apparatus is as follows:

After the nails have been placed over the hammer 24 by the nail-placing mechanism of the machine, a shoe is placed over the hammer guide as shown in Fig. 1, and a heel is placed over the heel-seat of the shoe. The operator then depresses the treadle 2'! which lowers the anvil 26 into contact with the heel. At the instant of contact, the clutch is engaged by the treadle and drives the hammer, forcing the nails into place. The concave face of the anvil acts to apply inwardly directed pressure against the wood heel and. the roughened face prevents slipping so that splitting of the heels is greatly reduced. After the nails are driven home, the treadle 2'; is released. This throws out the clutch and the spring 30 raises the anvil from the work so that the shoe can be removed.

Variations may be made without departing from the scope of the invention as it is defined by the following claims.

I claim:

1. In heel-nailing apparatus in which a hammer-guide is adapted to support a shoe and a hammer is slidably operable therein for driving nails, an anvil adapted to support the relatively fiat tread face of the heel against the driving forces, said anvil having a concave face of greater spread than the tread face of the heel for supporting and bearing against the tread face of the heel by contact with the margin of the latter and without initial contact at the intermediate region of the tread face.

2. In heel-nailing apparatus in which a hammer-guide is adapted to'support a shoe and a hammer is slidably operable therein for driving nails, an anvil adapted to support the tread face of the heel against the driving forces, said anvil having a concave face for supporting and bearing against the heel by contact with the margin of the latter and an element of cushioning material between said face and the body of the anvil.

3. In heel-nailing apparatus in which a hammer-guide is adapted to support a shoe and a hammer slidably operable therein for driving nails, an anvil adapted to support the tread face of the heel against the driving forces, said anvil having a roughened face of greater spread than the tread face of the heel engageable only with the peripheral margin of the heel.

4. In heel-nailing apparatus in which a hammer-guide is adapted to support a shoe and a hammer slidably operable therein for driving nails, an anvil adapted to support the relatively flat tread face of the heel against the driving forces, said anvil having a concave face member of greater spread than the tread face of the heel engageable with the margin of the heel without initial contact at the intermediate region of the tread face, and means for detachably securing said member to said anvil.

5. In heel-nailing apparatus in which a hammer-guide is adapted to support a shoe and a hammer is slidably operable therein for driving nails, an anvil adapted to support the relatively flat tread face of the heel against the driving forces, said anvil having a removable concave face of greater spread than the tread face of the heel having a knurled surface adapted to prevent slippage of the heel and to engage the margin of the tread face without initial contact at the intermediate region of the tread face.

6. In heel-nailing apparatus in which a hammer-guide is adapted to support a shoe and a hammer slidably" operable therein for driving nails, an anvil adapted to support the tread face of the heel against the driving forces, said anvil having a removable concave face having a knurled surface adapted to prevent slippage of the heel and to engage its perimeter, and cushion means for resiliently supporting said removable face.

7. An anvil for engaging the relatively flat tread face of a heel to support the same against the forces of driving nails, said anvil comprising a plate member having a concave face of greater spread than the tread face of the heel for engaging only the margin of the tread face of the heel, and projecting elements extending from the periphery of said plate member for detachably securing the member to the body of the anvil.

8. An anvil as defined in claim 7 comprising a cushion member at the back of said plate member adjacent said projecting elements.

CLARENCE M. DE \YOLFE. 

